<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .one{
            width: 100px;
            height: 100px;
            background-color: pink;
        }
        .two{
            width: 150px;
            height: 150px;
            background-color: aqua;
            float: right;
        }
        .three{
            width: 200px;
            height: 200px;
            background-color: orange;
            float: right;
        }
        .four{
            width: 300px;
            height: 300px;
            background-color: black;
        }
        .four-1{
            width: 50px;
            height: 50px;
            background-color: beige;
            float: right;
        }
    </style>
</head>
<body>
    <div class="one"></div>
    <div class="two"></div>
    <div class="three"></div>
    <div class="four">
        <div class="four-1"></div>
    </div>
</body>
</html>